:root {
	--main-color: #1a325a;
	--darkblue1: #1d2975;
	--darkblue2: #1a60a2;
	--bg: #153258;
	--noto: 'Noto Sans JP', sans-serif;
	--noto-serif: 'Noto Serif JP', serif;
	--poppins: 'Poppins', serif;
	--biz: 'BIZ UDGothic', serif;
	--oz: 'Oswald', sans-serif;
	--zenkaku: 'Zen Kaku Gothic Antique', sans-serif;
}

/* ===== Three Columns Section ===== */
.three-columns {
	padding: 60px 20px;
	background: #f5f7fa;
}
.three-back {
	max-width: 1200px;
	margin-inline: auto;
}
.columns-grid {
	display: grid;
	align-content: center;
	grid-template-columns: repeat(3, 1fr);
	gap: 30px;
}

.column-card {
	display: flex;
	flex-direction: column;
	background: #fff;
	border-radius: 10px;
	padding: 32px 24px;
	box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
	transition:
		transform 0.2s,
		box-shadow 0.2s;
}

.column-card:hover {
	transform: translateY(-4px);
	box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.column-icon {
	margin-inline: auto;
	width: 64px;
	height: 64px;
	margin-bottom: 16px;
}

.column-icon svg {
	width: 100%;
	height: 100%;
}

.column-card h3 {
	font-family: var(--zenkaku);
	font-size: 1.4rem;
	color: #1a1a4e;
	margin-bottom: 12px;
	font-weight: 900;
}

.column-card p {
	font-size: 1rem;
	color: #555;
	line-height: 1.8;
	flex-grow: 1;
}

.column-card .csj-block__media {
	margin: 16px 0 0;
}

.column-card .csj-block__media img {
	width: 100%;
	height: auto;
	border-radius: 6px;
	display: block;
}

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 768px) {
	.columns-grid {
		grid-template-columns: 1fr;
		gap: 20px;
	}

	.samples-showcase {
		grid-template-columns: repeat(3, 1fr);
		gap: 12px;
	}

	.specs-table thead th:first-child {
		width: 160px;
	}
}

/* Mobile */
@media (max-width: 480px) {
	.three-columns {
		padding: 40px 16px;
	}

	.column-card {
		padding: 24px 20px;
	}

	.samples-showcase {
		grid-template-columns: 1fr;
		gap: 16px;
	}
}